renamed README to README.md
Merge pull request #209 from nlake44/readme-fix

renamed README to README.md
also setting EC2_URL in environment if we see it
Merge pull request #207 from shatterednirvana/ec2-vars-from-appscalefile

Allowing users to specify EC2_ACCESS_KEY, EC2_SECRET_KEY, EC2_URL in their AppScalefile
Merge remote-tracking branch 'org/testing' into verbose-fix